Mktime error in awk on Snow Leopard

Question

Is mktime not working in Snow Leopard awk (version 20070501)?  I get the error: "awk: calling undefined function mktime" when I run a Bash script with: "awk '{run=$1; start_time=mktime($2" "$3" "$4" "$5" "$6" "$7)}".  It worked on other boxes, but I was not privy to what was loaded on those.  Maybe I'm asleep.  Maybe time functions aren't in the standard awk in Snow Leopard?  (seems unlikely to me.)  Any help appreciated.  Thanks.

Answer 1

Thanks Bob.  I feared that.  Of course, I am not really sure what flavor of awk we get as standard from Apple.  I guess my choices are to install gawk and hope that it won't cause any problems with other things depending on the Apple version or I'll insert my own function to do what I need.  And I may spend a few hours wondering why Apple didn't include gawk anyway.
Moving a little off the original topic: Is there a general way to figure out things like what Apple is giving us in the included Unix utilities/programs/etc?  In this particular case, I obviously knew to do 'awk -version' to get a version number, but I mean how does one know if this is BWK awk, gawk, mawk,awka, Jawk... yada, yada, yada?  Does one have to figure it out for any given utility?
Thanks again for the help.